Hi Kim!
Welcome back to the Disney Parks Moms Panel. I completely understand why you would want to reuse your
MagicBands from a previous trip, they are so incredibly convenient!
Disney estimates that the battery inside of a MagicBand is good for approximately 2 years. Since yours are from 2015 you are approaching that expiration, but I know plenty of folks that have used them beyond this with no issues! I would recommend you bring your MagicBands and load your tickets onto them using your
My Disney Experience account. In addition to that I would pack your Admission Cards you receive for your tickets in your bag as well. When you add them to your account, just write on the back of the card with a Sharpie to make note of which ID number goes to each individual in your party.
Hopefully they will still work and you'll be able to use them for your stay! If for some reason one of them does not, at least you are well prepared with your Admission Cards as a backup, which you can then use to enter the parks and take advantage of any
FastPass+ reservations you've already booked! If you so desire you can also purchase MagicBands from several retailers inside the parks, add them to your My Disney Experience and use those as well! It's entirely up to you.
Please let me know if you have any other questions!
-Lindsey ºOº